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E_SYNCENGINE_UNSUPPORTED_MARKET
Within Windows cloud-file and sync-engine infrastructure, E_SYNCENGINE_UNSUPPORTED_MARKET reports that the sync service is unavailable for the current market or account region. Diagnosis of this result should follow the original owner and generation rather than treating the visible symptom as the cause.
Mechanism behind the code
Availability may be determined by account tenant, service rollout, legal region, SKU or endpoint configuration rather than the machine locale alone.
High-value telemetry
- Account tenant and service region.
- Configured endpoint.
- Client market/locale inputs.
- Service entitlement response.
Decision table
- Second supported path for the same stable item: a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: keep account, remote item version, and client build fixed.
- Reduced failing operation: If this result follows the reduced step, the rejecting transition is localized. Hold constant: retain account tenant and service region and remove only unrelated work.
- Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: use the account’s authoritative region. Hold constant: keep the original failing sample available for the final regression test.
Safe reduction procedure
Use a disposable control object, repository copy, file, or device association where the subsystem permits that safely.
- First: Use the account’s authoritative region.
- Next: Check service/SKU availability.
- Then: Avoid overriding locale as a proxy for entitlement.
- Finally: Surface a non-retryable regional limitation clearly.
Do not erase the distinction
During an investigation, STORAGE_SERVICE_BLOCKED is an account restriction; UNSUPPORTED_MARKET is service availability by region/market.
Do not use VPN or locale changes to bypass service policy.
Successful outcome
Verify it with the original scenario, one boundary case, and one deliberate failure; success means supported accounts reach the correct regional endpoint and unsupported accounts fail without retry storms.
Technical references
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